QPHY-MIPI-D-PHY. Instruction Manual

Transcription

1 QPHY-MIPI-D-PHY MIPI D-PHY Serial Data Compliance Software Instruction Manual Revision A November, 2017 Relating to: XStreamDSO v.8.5.x.x and later QualiPHY Software v.8.5.x.x and later f

2 700 Chestnut Ridge Road Chestnut Ridge, NY, Tel: (845) , Fax: (845) teledynelecroy.com 2017 Teledyne LeCroy, Inc. All rights reserved. Customers are permitted to duplicate and distribute Teledyne LeCroy documentation for internal training purposes. Unauthorized duplication is strictly prohibited. Teledyne LeCroy and other product or brand names are trademarks or requested trademarks of their respective holders. Information in this publication supersedes all earlier versions. Specifications are subject to change without notice Rev A November, 2017

3 Table of Contents QPHY-MIPI-D-PHY Instruction Manual Introduction... 1 About QualiPHY... 1 About QPHY-MIPI-D-PHY... 1 Required Equipment... 1 Optional Equipment... 2 Required Host Computer System... 4 Installation and Setup... 5 Install Base Application... 5 Activate Components... 5 Set Up Dual Monitor Display... 5 Set Up Remote Control... 6 Configure Oscilloscope for Remote Control... 6 Add Connection to QualiPHY... 6 Select Connection... 6 Using QualiPHY... 7 Accessing the Software... 7 General Setup... 8 Connection tab... 8 Session Info tab... 8 Report tab... 8 Advanced tab... 8 About tab... 8 QualiPHY Test Process... 9 Set Up Test Session... 9 Run Tests Run Reports Customizing QualiPHY Copy Configuration Select Tests Edit Variables Edit Test Limits X-Replay Mode QPHY-MIPI-D-PHY Testing Test Preparation Required Test Modes QPHY-MIPI-D-PHY Test Configurations Dp-Dn-CLKp-CLKn LP tests (4 probes) Dp-Dn-CLKp-CLKn HS tests (4 probes) Dp-Dn-CLKp-CLKn Eye Diagram tests (Debug) Demo of all conformance tests Demo of debug tests QPHY-MIPI-D-PHY Test Descriptions Eye Diagrams (High Speed) HS Tests LP Tests QPHY-MIPI-D-PHY Variables Main Settings Script Settings Variables Demo Settings Variables Probe Setup <Setup> Variables QPHY-MIPI-D-PHY Limit Sets Appendix A: Manual Deskewing Procedures Cable Deskewing Using the Fast Edge Output Cable Deskewing Without Using the Fast Edge Output Rev Error! Reference source not found. i

4 Table of Figures Figure 1 - QualiPHY framework dialog and Standard selection menu....7 Figure 2 - The Test Report Summary and Details pages Figure 3 Configuration Test Selector tab Figure 4 X-Replay Mode window Figure 5 - The Skew parameter right side dialog, Skew clock 2 tab, showing default setup About This Manual This manual assumes that you are familiar with using an oscilloscope in particular the Teledyne LeCroy oscilloscope that will be used with QualiPHY and that you have purchased the QPHY-MIPI-D-PHY software option. Some of the images in this manual may show QualiPHY products other than QPHY- MIPI-D-PHY, or were captured using different model oscilloscopes, as they are meant to illustrate general concepts only. Rest assured that while the user interface may look different from yours, the functionality is identical. ii

5 QPHY-MIPI-D-PHY Instruction Manual Introduction About QualiPHY QualiPHY is highly automated compliance test software meant to help you develop and validate the PHY (physical-electrical) layer of a device, in accordance with the official documents published by the applicable standards organizations and special interest groups (SIGs). You can additionally set custom variables and limits to test compliance to internal standards. QualiPHY is composed of a framework application that enables the configuration and control of separate tests for each standard through a common user interface. Features include: Multiple Data Source Capability User-Defined Test Limits: Tighten limits to ensure devices are well within the passing region, even if subsequently measured with different equipment. Flexible Test Results Reporting that includes XML Test Record Generation. Understand a device performance distribution, or obtain process related information from the devices under test. About QPHY-MIPI-D-PHY QPHY-MIPI-D-PHY is an automated test package designed to capture, analyze, and report measurements in conformance with MIPI Alliance Specification for D-PHY version It can be run on any Teledyne LeCroy oscilloscope with at least 4 GHz Bandwidth and 20 GS/s Sample Rate. Required Equipment Teledyne LeCroy real-time oscilloscope, 4 GHz BW, installed with: o o XStreamDSO v.6.3.x.x minimum* with an activated QPHY-MIPI-D-PHY option key QualiPHY v.6.3.x.x minimum with an activated QPHY-MIPI-D-PHY component Four (4) differential probes and platform cable assemblies *Note: The versions of XStreamDSO and QualiPHY software must match, so upgrade your version of QualilPHY if you have upgraded your oscilloscope firmware. The versions listed above are the minimum versions required for this product. The QualiPHY software may be installed on a remote PC, but all other software must be run on the oscilloscope Rev Error! Reference source not found. 1

6 Optional Equipment These test fixtures are available from the University of New Hampshire InterOperability Laboratory (UNH-IOL) MIPI D-PHY reference termination board MIPI TLIS board 2

7 QPHY-MIPI-D-PHY Instruction Manual MIPI D-PHY probing board Rev Error! Reference source not found. 3

8 SMA alignment fixture SMA couplers For the most complete and up-to-date list, see the UNH-IOL website: Required Host Computer System Usually, the oscilloscope is the host computer for the QualiPHY software, and all models that meet the acquisition requirements will also meet the host system requirements. However, if you wish to run the QualiPHY software from a remote computer, these minimum requirements apply: Operating System: o o Windows 7 Professional Windows 10 Professional 1 GHz or faster processor 1 GB (32-bit) or 2 GB (64-bit) of RAM Ethernet (LAN) network capability Hard Drive: o At least 100 MB free to install the framework application o Up to 2 GB per standard installed to store the log database (each database grows from a few MB to a maximum of 2 GB) See Set Up Remote Control for configuration instructions. 4

9 Installation and Setup QPHY-MIPI-D-PHY Instruction Manual QualiPHY is a Windows-based application that can be configured with one or more serial data compliance components. Each compliance component is purchased as a software option. Install Base Application Download the latest version of the QualiPHY software from: teledynelecroy.com/support/softwaredownload under Oscilloscope Downloads > Software Utilities. If the oscilloscope is not connected to the Internet, copy the installer onto a USB memory stick then transfer it to the oscilloscope desktop or a folder on a D:\ drive to execute it. Run QualiPHYInstaller.exe and follow the installer prompts. Choose all the components you plan to activate. If you omit any components now, you will need to update the installation to activate them later. By default, the oscilloscope appears as local host when QualiPHY is executed on the oscilloscope. Follow the steps under Add Connection to QualiPHY to check that the IP address is Activate Components The serial data compliance components are factory installed as part of the main application in your oscilloscope and are individually activated through the use of an alphanumeric code uniquely matched to the oscilloscope s serial number. This option key code is what is delivered when purchasing a software option. To activate a component on the oscilloscope: 1. From the menu bar, choose Utilities > Utilities Setup. 2. On the Options tab, click Add Key. 3. Use the Virtual Keyboard to Enter Option Key, then click OK. If activation is successful, the key code now appears in the list of Installed Option Keys. 4. Restart the oscilloscope application by choosing File > Exit, then double-clicking the Start DSO icon on the desktop. Set Up Dual Monitor Display Teledyne LeCroy recommends running QualiPHY on an oscilloscope equipped with Dual Monitor Display capability. This allows the waveform and measurements to be shown on the oscilloscope LCD display while the QualiPHY application and test results are displayed on a second monitor. See the oscilloscope Operator s Manual or Getting Started Manual for instructions on setting up dual monitor display Rev Error! Reference source not found. 5

10 Set Up Remote Control QualiPHY software can be executed from a remote host computer, controlling the oscilloscope through a LAN Connection. To set up remote control: The oscilloscope must be connected to a LAN and assigned an IP address (fixed or dynamic). The host computer must be on the same LAN as the oscilloscope. Configure Oscilloscope for Remote Control 1. From the menu bar, choose Utilities Utilities Setup Open the Remote tab and set Remote Control to TCP/IP. 3. Verify that the oscilloscope shows an IP address. Add Connection to QualiPHY 1. On the host PC, download and run QualiPHYInstaller.exe. 2. Start QualiPHY and click the General Setup button. 3. On the Connection tab, click Scope Selector. 4. Click Add and choose the connection type. Enter the oscilloscope IP address from Step 3 above. Click OK. 5. When the oscilloscope is properly detected, it appears on the Scope Selector dialog. Select the connection, and click OK. QualiPHY is now ready to control the oscilloscope. Select Connection Multiple oscilloscopes may be accessible to a single remote host. In that case, go to General Setup and use the Scope Selector at the start of the QPHY session to choose the correct connection. QualiPHY tests the oscilloscope connection when starting a test. The system warns you if there is a connection problem. 6

11 Using QualiPHY QPHY-MIPI-D-PHY Instruction Manual This section provides an overview of the QualiPHY user interface and general procedures. For detailed information about the QPHY-MIPI-D-PHY software option, see QPHY-MIPI-D-PHY Testing. Accessing the Software Once QualiPHY is installed and activated, it can be accessed from the oscilloscope menu bar by choosing Analysis > QualiPHY, or by double-clicking the QualiPHY desktop icon on a remote computer. The QualiPHY framework dialog illustrates the overall software flow, from general set up through running compliance tests. Work from left to right, making all desired settings on each sub-dialog. Figure 1 - QualiPHY framework dialog and Standard selection menu. The sub-dialogs are organized into tabs each containing configuration controls related to that part of the process. These are described in more detail in the following sections. If Pause on Failure is checked, QauliPHY prompts to retry a measure whenever a test fails. Report Generator launches the manual report generator dialog. The Exit button at the bottom of the framework dialog closes the QualiPHY application Rev Error! Reference source not found. 7

12 General Setup The first sub-dialog contains general system settings. These remain in effect for each session, regardless of Standard, until changed. Connection tab Shows IP Address of the test oscilloscope (local host if QualiPHY is run from the oscilloscope). The Scope Selector allows you to choose the oscilloscope used for testing when several are connected to the QualiPHY installation. See Set Up Remote Control for details. Session Info tab Optional information about the test session that may be added to reports, such as: Operator Name, Device Under Test (DUT), Temperature (in C) of the test location, and any additional Comments. There is also an option to Append Results or Replace Results when continuing a previous session. To optimize report generation, enter at least a DUT name at the beginning of each session. Report tab Settings related to automatic report generation. Choose: Reporting behavior of: o o o Ask to generate a report after tests, where you ll be prompted to create a new file for each set of test results. Never generate a report after tests, where you ll need to manually execute the Report Generator to create a report. Always generate a report after tests, to autogenerate a report of the latest test results. Default report output type of XML, HTML, or PDF. A generic Output file name, including the full path to the report output folder. Optionally, check Allow style sheet selection in Report Generator to enable the use of a custom.xslt when generating reports (XML and HTML output only). The path to the.xslt is entered on the Report Generator dialog. Report Generator launches the Report Generator dialog, which contains the same settings as the Report tab, only applied to individual reports. Advanced tab This tab launches the X-Replay Mode dialog. See X-Replay Mode. About tab Information about your QualiPHY installation. 8

13 QPHY-MIPI-D-PHY Instruction Manual QualiPHY Test Process Once general system settings are in place, these are the steps for running test sessions. Set Up Test Session 1. Connect the oscilloscope to the DUT. See QPHY-MIPI-D-PHY Testing Physical Setup. 2. Access the QualiPHY software to display the framework dialog. 3. If running QualiPHY remotely, click General Setup and open the Scope Selector to select the correct oscilloscope connection. 4. If you have more than one component activated, click Standard and select the desired standard to test against. Otherwise, your one activated component will appear as the default selection. Note: Although all the QualiPHY components appear on this dialog, only those selected when installing QualiPHY are enabled for selection now. 5. Click the Configuration button and select the test configuration to run. These pre-loaded configurations are set up to run all the tests required for compliance and provide a quick, easy way to begin compliance testing. See QPHY-MIPI-D-PHY Test Configurations for a description of your configurations. You can also create custom configurations for internal compliance tests by copying and modifying the pre-loaded configurations. See Customizing QualiPHY for details. 6. Close the Edit/View Configuration dialog to return to the framework dialog Rev Error! Reference source not found. 9

14 Run Tests 1. On the framework dialog, click Start to begin testing. When tests are in progress, this button changes to Stop. Click it at any time to stop the test in process. You ll be able to resume from the point of termination or from the beginning of the test. 2. Follow the pop-up window prompts. QualiPHY guides you step-by-step through each of the tests described in the standard specification, including diagrams of the connection to the DUT for each required test mode. 3. When all tests are successfully completed, both progress bars on the framework dialog are completely green and the message All tests completed successfully appears. If problems are encountered, you ll be offered options to: Retry the test from the latest established point defined in the script Ignore and Continue with the next test Abort Session 10

15 QPHY-MIPI-D-PHY Instruction Manual Run Reports The QualiPHY software automates report generation. On the framework dialog, go to General Setup > Report to pre-configure reporting behavior. You can also manually launch the Report Generator from the framework dialog once a test is run. The Report Generator offers the same selections as the Report tab, only applied to each report individually, rather than as a system setting. This enables you to save reports for each test session, rather than overwrite the generic report file. There are also options to link a custom style sheet (.xslt) to the report, or to Exclude Informative Results. The Test Report includes a summary table with links to the detailed test result pages. Figure 2 - The Test Report Summary and Details pages. Reports are output to the folder C:\LeCroy\QPHY\Reports. You can add your own logo to the report by replacing the file C:\LeCroy\QPHY\StyleSheets\CustomerLogo.jpg. The recommended maximum size is 250x100 pixels at 72 ppi, 16.7 million colors, 24 bits. Use the same file name and format Rev Error! Reference source not found. 11

16 Customizing QualiPHY The pre-loaded configurations cannot be modified. However, you can create your own test configurations by copying one of the standard test configurations and modifying it. Copy Configuration 1. Access the QualiPHY framework dialog and select a Standard. 2. Click Edit/View Configuration and select the configuration upon which to base the new configuration. This can be a pre-loaded configuration or another copy. 3. Click Copy and enter a name and description. Once a custom configuration is defined, it appears on the Configuration tab followed by (Copy). 4. Select the new, custom configuration and follow the procedures below to continue making changes. Note: If any part of a configuration is changed, the Save As button becomes active on the bottom of the dialog. If a custom configuration is changed, the Save button will also become active to apply the changes to the existing configuration. 12

17 QPHY-MIPI-D-PHY Instruction Manual Select Tests On the Test Selector tab, check the tests that make up the configuration. Each test is defined by the MIPI-D-PHY standard. A description of each test is displayed when it is selected. To loop any of the tests in this configuration, select the test from the list, then choose to Loop the highlighted test until stopped or enter the number of repetitions. Figure 3 Configuration Test Selector tab Rev Error! Reference source not found. 13

18 Edit Variables The Variable Setup tab contains a list of test variables. See QPHY-MIPI-D-PHY Variables for a description of each. To modify a variable: 1. Select the variable on the Variable Setup tab, then click Edit Variable. (You can also choose to Reset to Default at any time.) 2. The conditions of this variable appear on a pop-up. Choose the new condition to apply. 14

19 QPHY-MIPI-D-PHY Instruction Manual Edit Test Limits The Limits tab shows the Limit Set currently associated with the configuration. Any limit set can be associated with a custom configuration by selecting it in this field. The Limits Manager shows the settings for every test limit in a limit set. Those in the default set are the limits defined by the standard. To create a custom limit set: 1. On the Limits tab, click Limits Manager. 2. With the default set selected, click Copy Set and enter a name. Note: You can also choose to copy and/or modify another custom set that has been associated with this configuration. 3. Double click the limit to be modified, and in the pop-up enter the new values. You can also Import Limits from a.csv file. Navigate to the file location after clicking the button. Tip: Likewise, Export Limits creates a.csv file from the current limit set. You may wish to do this and copy it to format the input.csv file Rev Error! Reference source not found. 15

20 X-Replay Mode The X-Replay mode window is an advanced ( developer ) view of QualiPHY. The tree in the upper-left frame enables you to navigate to processes in the MIPI-D-PHY test script, in case you need to review the code, which appears in the upper-right frame. Two other particularly useful features are: A list of recent test sessions in the lower-left frame. While you can only generate a report of the current test session in the QualiPHY wizard, in X-Replay Mode you can generate a report for any of these recent sessions. Select the session and choose Report > Create Report from the menu bar. The QualiPHY log in the bottom-right frame. The frame can be split by dragging up the lower edge. The bottom half of this split frame now shows the raw Python output, which can be useful if ever the script needs debugging. Figure 4 X-Replay Mode window 16

21 QPHY-MIPI-D-PHY Instruction Manual QPHY-MIPI-D-PHY Testing Test Preparation Before beginning any test or data acquisition, the oscilloscope should be warmed for at least 20 minutes. Calibration is automatic under software control and no manual calibration is required. This procedure will be run again if the temperature of the oscilloscope changes by more than a few degrees. Required Test Modes The QPHY-MIPI-D-PHY script requires that you place the DUT (Device Under Test) in the required test modes. The script will prompt you to do so before each specific test, but it is recommended that you ensures the DUT is capable of being placed in the required test modes before beginning testing. QPHY-MIPI-D-PHY Test Configurations Test configurations include variable settings, limit sets, and test selections. See QPHY-MIPI-D-PHY Variables for a description of each variable and its default value. To save the waveforms acquired, change the variable Save Acquired Waveforms in the Default variable set to Yes. Dp-Dn-CLKp-CLKn LP tests (4 probes) This configuration will run all LP tests using the Default variable set. Dp-Dn-CLKp-CLKn HS tests (4 probes) This configuration will run all HS tests using the Default variable set. Dp-Dn-CLKp-CLKn Eye Diagram tests (Debug) This configuration will run all Eye Diagram tests using the Default variable set. Demo of all conformance tests This configuration will run a demonstration of all conformance tests using waveforms stored in the oscilloscope D: directory. All variables are set to defaults, except Use Stored Waveforms is set to Yes. Demo of debug tests This configuration will run a demonstration of debug tests (i.e., Eye Diagram) using waveforms stored in the oscilloscope D: directory. All variables are set to defaults, except Use Stored Waveforms is set to Yes Rev Error! Reference source not found. 17

22 QPHY-MIPI-D-PHY Test Descriptions The descriptions for the following tests performed by QPHY-MIPI-DPHY can be found in the MIPI Alliance Test Program D-PHY Physical Layer Conformance Test Suite Version The tests within each configuration are organized by probe setup. Conformance tests use the probe setup Dp-Dn-CLKp-CLKn. If tests using other probe setups are selected for custom configurations, the user is prompted to change setups as needed while the test is running. Eye Diagrams (High Speed) 18 Dp Dn Ddiff CLKp CLKn CLKdiff HS Tests Data Lane HS Bitrate and UI VOD(1,0) (Clock and Data) dvod(1,0) (Clock and Data) VOHHS (Clock and Data) VCMTX(1,0) (Clock and Data) dvcmtx(1,0) (Clock and Data) TR / TF (Clock and Data) dvcmtx(hf) and dvcmtx(lf) (Clock and Data) TLPX (Clock and Data) THS-Prepare (Data Only) THS-Prepare+THS-Zero (Data Only) THS-Trail (Data Only) THS-Exit (Clock and Data) TEOT (Clock and Data) TREOT (Clock and Data) TCLK-Trail (Clock Only) TLK-Prepare (clock Only) TCLK-Prepare+TCLK-Zero (Clock Only) TCLK-Pre (Clock to Data Timing) TCLK-Post (Clock to Data Timing) First Bit (Clock to Data Timing) TSkew (Clock to Data Timing) LP Tests VOH / VOL (Clock and Data)

23 QPHY-MIPI-D-PHY Instruction Manual TRLP / TFLP (Clock and Data) Maximum Slew Rate (Clock and Data) Minimum Slew Rate (Clock and Data) Minimum Rising (Clock and Data) Minimum Rising (Clock and Data) TLP-Pulse-Tx (Data Only) TLP-Per-Tx (Data Only) Rev Error! Reference source not found. 19

24 QPHY-MIPI-D-PHY Variables Main Settings Clock N Signal Name This variable is used to specify the Clock Negative Signal. The default value is CLKn. DUT Bit Rate in High-Speed Mode in Mbps This variable is used to set the oscilloscope timebase and sampling rate, see Clock Period Per Screen Division for more explanation. The default value is 650 Mbps. Note from the MIPI Specification: The actual maximum achievable bit rate in High-Speed mode is determined by the performance of transmitter, receiver and interconnect implementations. Therefore, the maximum bit rate is not specified in this document. However, this specification is primarily intended to define a solution for a bit rate range of 80 to 1000 Mbps per Lane. Although PHY Configurations are not limited to this range, practical constraints make it the most suitable range for the intended applications. It is anticipated a typical implementation will have a bit rate of approximately 650 Mbps per Lane. DUT IC Supply Voltage This variable is used to specify the IC supply voltage for the device under test. The default value is 1.2V Clock P Signal Name This variable is used to specify the Clock Positive Signal. The default value is CLKp. Data N Signal Name This variable is used to specify the Data Negative Signal. The default value is Dn. Data P Signal Name This variable is used to specify the Data Positive Signal. The default value is Dp. Clock Diff Signal Name Name of Clock Differential Signal. Default is CLKdiff. Data Diff Signal Name Name of Data Differential Signal. Default is Ddiff. Select Measure on All or One HS Burst This variable allows you to select whether to perform all high speed measurements on the entire acquired waveform or only on one burst at a time. This was included as an advanced debugging giving higher statistical stability capability. The default for this variable is All Bursts. Select Index When Measuring One Burst This variable allows you to manually specify the burst index (number) of the burst that they would like to measure. This index does not count partial bursts at the beginning of the waveform. Default is 1. XRCV_HS_PARTIALBURSTS Allows partial bursts in all HS measurements. Should only be set if bursts are very long, so measurements are made at the end of one burst and the beginning of the next burst. May be needed for DSI. 20

25 QPHY-MIPI-D-PHY Instruction Manual Script Settings Variables Stop on Test to Review Results This variable allows you to pause the execution of QualiPHY after each test. The default value is No. When set to Yes, the script will stop after each test to allow for result reviewing. The setup will be saved so that oscilloscope settings can be modified by you. On resume, the setup will be recalled. Note that any new acquisition done in the meantime might cause the script to misbehave. Silent Mode Control This variable is used to set QualiPHY to run in silent mode. In silent mode, no user interaction is required. The default value is No. Save Acquired Waveforms This variable is used to specify whether to save the acquired waveforms or not. The default value is No. This setting is ignored if the Use Stored Waveforms variable is set to Yes. Waveforms will be saved in the directories specified by the variables Waveform Path, Folder for HS Waveforms and Folder for LP Waveforms. Waveform Path Full path to the oscilloscope folder used to save/recall waveforms. When not in Demo Mode and Save acquired waveforms is enabled, waveform files are saved in this folder. When in Demo Mode or set to Use Stored Traces, saved waveforms are recalled from this folder. The default value for this variable is D:\Waveforms\MIPIDPHY. Demo Settings Variables Recall Waveform File Index (5 digits) 5-digit number of the waveform file to use when running demo configurations (multiple waveforms stored in the same directory will be numbered 00000, 00001, 00002, etc.). Default is Use Stored Waveforms This variable allows you to run the selected tests on previously saved waveforms. The default value is No for conformance tests, Yes for demo configuration tests. Define Format Used to Set Trace Names This variable allows you to specify the waveform file name format. Choices are: LeCroy: compose waveform names automatically from signal names Dialog: Manually enter waveform names Custom: Set the name of the waveform in the XX HS Filename and XX LP Filename variables Rev Error! Reference source not found. 21

26 Probe Setup <Setup> Variables These variables are repeated for each test group (LP, HS, and Eye Diagram) within each type of probe setup. <Signal> Channel Index This variable allows you to manually specify the channel used to acquire the respective signal Dp, Dn, CLKp or CLKn. The default values are 1 for Dp, 2 for Dn, 3 for CLKp and 4 for CLKn. <Signal> Channel Invert This variable allows you to invert the respective signal. Default is False. Data Lanes This variable allows you to specify the Data Lane(s) tested. Any subset of D0, D1, D2, or D3 is accepted. Set all Data Lanes the DUT implements for a complete validation. The default value is D0. Folder for <LP HS > Waveforms This variable allows you to specify the name of the subfolder that will be created inside the Waveform Path folder for storing the LP or HS waveforms. ZID Termination Values for <LP HS> (in Ohms) This allows you to set the termination values for the lane under test for the respective mode. Running test with each value (50,Open) is a specification requirement. You can set a subset in case the lane termination cannot be controlled (partial validation). <Signal> Filename This variable allows you to specify the name of the waveform file to be used for the respective signal when running on saved waveforms. This file is only used when Use Saved Waveforms is set to Yes. 22

27 HS Mode Forward / Reverse Direction This variable is used to compute THS-TRAIL min limit: (max( n*8*ui, 60 ns + n*4*ui ) Where n = 1 for Forward-direction HS mode and n = 4 for Reverse-direction HS mode QPHY-MIPI-D-PHY Instruction Manual Reverse-direction is a special mode of transmission of HS-Data. MIPIDPHY spec. definition: A Lane enters the Reverse High-Speed Data Transmission mode by means of a Link Turnaround procedure as specified in section 5.5. Reverse Data Transmission is not source-synchronous; the Clock signal is driven by the Master side while the Data Lane is driven by the Slave side. The Slave Side transmitter shall send one data bit every two periods of the received Clock signal. Therefore, for a given Clock frequency, the Reverse direction data rate is one-fourth the Forward direction data rate. The bit period in this case is defined to be 4*UIINST. UIINST is the value specified for the full-rate forward transmission. DUT UI Inst Minimum Value This variable allows you to specify the minimum instantaneous UI possible within a High-Speed data transfer for a given implementation. This value must be obtained from the DUT vendor. The default value is 1e-9. on of HS-Data. QPHY-MIPI-D-PHY Limit Sets The default installation of QPHY-MIPI-D-PHY contains only one limit set, called Default. In this script, limits are only used to convey Unit labels. The actual limits for each value tested are encoded in or computed by the script and cannot be changed Rev Error! Reference source not found. 23

28 Appendix A: Manual Deskewing Procedures This section is only applicable to the oscilloscope and the cables connecting to the oscilloscope channels.. Cable Deskewing Using the Fast Edge Output The following procedure demonstrates how to manually deskew two oscilloscope channels and cables using the fast edge output, with no need for any T connector or adapters. Note: Fast Edge output is available only on some models. If your oscilloscope does not have Fast Edge output, see Cable Deskewing Without Using the Fast Edge Output. This can be done once the temperature of the oscilloscope is stable. The oscilloscope must be warmed up for at least 20 min. before proceeding. This procedure should be run again if the temperature of the oscilloscope changes by more than a few degrees. For the purpose of this procedure, the two channels being deskewed are referred to as Channel X and Channel Y. The reference channel is Channel X and the channel being deskewed is Channel Y. 1. Begin by recalling the Default Oscilloscope Setup. 2. Configure the oscilloscope as follows: Timebase i. Fixed Sample Rate ii. Set the Sample Rate to 40 GS/s iii. Set the Time/Division to 1 ns/div Channels i. Turn on Channel X and Channel Y. ii. Set V/div for Channel X and Channel Y to 100mV/div. iii. Set the Averaging of Channel X and Channel Y to 500 sweeps. iv. Set the Interpolation of Channel X and Channel Y to Sinx/x. 24

29 QPHY-MIPI-D-PHY Instruction Manual Trigger i. Configure to Source to be FastEdge. ii. Set the Slope to Positive. Parameter Measurements: i. Set the source for P1 to CX and the measure to Delay. ii. Set the source for P2 to CY and the measure to Delay. iii. Set the source for P3 to M1 and the measure to Delay. 3. Set the display to Single Grid. Click Display Single Grid. 4. Using the appropriate adapter, connect Channel X to the Fast Edge Output of the oscilloscope. 5. Adjust the Trigger Delay so that the Channel X signal crosses at the center of the screen. 6. Change the Timebase to 50 ps/div. 7. Fine tune the Trigger Delay so that the Channel X signal crosses at the exact center of the screen. 8. Press the Clear Sweeps button on the front panel to reset the averaging. 9. Allow multiple acquisitions to occur until the waveform is stable on the screen Rev Error! Reference source not found. 25

30 10. Save Channel X to M1. Click File Save Waveform. Set Save To Memory. Set the Source to CX. Set the Destination to M1. Click Save Now. 11. Disconnect Channel X from the Fast Edge Output and connect Channel Y to the Fast Edge Output. 12. Press the Clear Sweeps button on the front panel to reset the averaging. 13. Allow multiple acquisitions to occur until the waveform is stable on the screen. 14. From the Channel Y menu, adjust the Deskew of Channel Y until Channel Y is directly over the M1 trace. 15. Ensure that P3 and P2 are reasonably close to the same value. (Typically < 5ps difference) 26

31 UU QPHY-MIPI-D-PHY Instruction Manual Cable Deskewing Without Using the Fast Edge Output The following procedure demonstrates how to manually deskew two oscilloscope channels and cables using the differential data signal, with no need for any T connector or adapters. This can be done once the temperature of the oscilloscope is stable. The oscilloscope must be warmed up for at least a half-hour before proceeding. This procedure should be run again if the temperature of the oscilloscope changes by more than a few degrees. 1. Connect a differential data signal to C1 and C2 using two approximately matching cables. Set up the oscilloscope to use the maximum sample rate. Set the timebase for a few repetitions of the pattern (at least a few dozen edges). 2. On the C3 menu, check Invert. Now C1 and C2 should look the same. 3. Using the Measure Setup, set P1 to measure the Skew of C1, C2. Turn on Statistics (Measure menu). Write down the mean skew value after it stabilizes. This mean skew value is the addition of Data skew + cable skew + channel skew. 4. Swap the cable connections on the Data source side (on the test fixture), and then press the Clear Sweeps button on the oscilloscope (to clear the accumulated statistics; since we changed the input). 5. Write down the mean skew value after it stabilizes. This mean skew value is the addition of (- Data skew) + cable skew + channel skew. 6. Add the two mean skew values and divide the sum in half: [Data skew + cable skew + channel skew] + [ (-Data skew) + cable skew + channel skew]uu 2 The above formula simplifies to: [cable skew + channel skew] 7. Set the resulting value as the Deskew value in C1 menu. 8. Restore the cable connections to their Step 1 settings (previous). Press the Clear Sweeps button on the oscilloscope. The mean skew value should be approximately zero - that is the data skew. Typically, results are <1ps given a test fixture meant to minimize skew on the differential pair. 9. On the C2 menu, clear the Invert checkbox and turn off the parameters Rev Error! Reference source not found. 27

32 In the previous procedure, we used the default setup of the Skew parameter (which is detecting positive edges on both signals at 50%). We also inverted C2 in order to make C1 and C2 both have positive edges at the same time. Alternately, we clearly could have not inverted C2 and instead selected the Skew clock 2 tab in the P1 parameter menu and set the oscilloscope to look for negative edges on the second input (C2). However, we believe that the previous procedure looks much more aesthetically pleasing from the display as it shows C2 and C3 with the same polarity. Figure 5 - The Skew parameter right side dialog, Skew clock 2 tab, showing default setup. 28

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